American Heritage Dictionary
(4)
Century Dictionary
(16)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
This differentiation is at a level consistent with intraspecific variation.— CiteULike: Everyone's library
For Grand, this differentiation was a core part of what made his Creatures valuable.— SEEDMAGAZINE.COM
It is a first-in-class multi-faceted molecule that promotes endothelial cell differentiation, angiogenesis in dermal tissues, keratinocyte migration, collagen deposition, and down-regulates inflammation.— Medlogs - Recent stories
Epigenetics refers to features of organisms that are stable over successive rounds of cell division but which do not involve changes in the underlying DNA sequence cellular differentiation, allowing cells to maintain different characteristics despite containing the same genomic material.— Citizendium, the Citizens' Compendium - Recent changes [en]
"In the last few years, some discoveries have challenged the long-standing belief that cell differentiation is an irreversible final process," said Oliver, the paper's senior author.

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a month.
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